Claiming Slave Omega as My Luna

"For power! She murdered her Alpha parents!"
I stared in horror at my boyfriend and his parents, once my parents' most loyal Beta. Now they held torches illuminating my face, while my parents' lifeless bodies and pools of blood stained the floor beneath us.
"I – Grant, new Alpha heir of Aurora Pack – reject you, this shameless murderer, as my Luna, and banish you forever to the Werebear Tribe."
The Werebear leader and his soldiers watched hungrily. "Come, little bitch, our cocks are waiting for you. We'll break you one by one."
--
At fifteen, my Alpha parents were brutally murdered for reasons unknown. My boyfriend and his Beta father burst into our home, naming me the only suspect. From that day forward, I became the pack's lowest Omega, my shifting abilities sealed, subjected to endless abuse. Three years later, my boyfriend officially became the pack's new Alpha heir. At his celebration, he formally rejected me and sold me to the Werebear Tribe, condemning me to be used and gang-raped to death.
Unable to endure any more, I desperately escaped to the Northern Pack, only to be captured as a rogue wolf and thrown into their dungeon awaiting the Alpha's death sentence. I thought perhaps this was my fate – to die by another's cruel hand.
But suddenly before my death, my wolf let out a powerful howl.
"MATE!"